"How big are these tours getting to be? The New York Times recently listed more than 40 different house and garden tours in the New York region and surrounding areas alone for the spring, the height of the house tour season.
...The number of house tours around the country has grown so large that it's no longer easy to generalize about their scope and nature. Tours may include an eclectic mix of styles, eras and levels of luxury. And they explore inner cities, downtown areas, rich suburbs and gentrifying urban areas.
Some have a sharp focus, such as the Frank Lloyd Wright Preservation Trust's annual Wright Plus Benefit House Tour, in Oak Park, Illinois."